<p>An elderly man allegedly killed his mentally challenged son by poisoning him in a retiring room at the KSR Bengaluru railway station before attempting suicide by consuming the same poison, police said. </p>.<p>B Rajagopal, 61, checked into the retiring room along with his son Radha Krishna, 31, on Friday evening. He gave his son poison-laced juice and then drank it, too. Both the men started to vomit soon after, drawing railway staff and other passengers. They were rushed to a hospital where doctors declared Krishna brought dead while Rajagopal remains critical, said a senior officer from railway police. </p>.<p>A preliminary investigation showed that Rajagopal had been under depression for several years now as his son was mentally unsound. </p>.<p>Rajagopal worked in Hyderabad and retired recently. The family shifted to JP Nagar in Bengaluru. Rajagopal told his wife that he and Krishna would travel to Chennai for a function. He refused to take his wife along, police said and hinted that Rajagopal had planned the murder-cum-suicide in advance. </p>.<p>Police have booked Rajaopgal for murder and attempted suicide. </p>
<p>An elderly man allegedly killed his mentally challenged son by poisoning him in a retiring room at the KSR Bengaluru railway station before attempting suicide by consuming the same poison, police said. </p>.<p>B Rajagopal, 61, checked into the retiring room along with his son Radha Krishna, 31, on Friday evening. He gave his son poison-laced juice and then drank it, too. Both the men started to vomit soon after, drawing railway staff and other passengers. They were rushed to a hospital where doctors declared Krishna brought dead while Rajagopal remains critical, said a senior officer from railway police. </p>.<p>A preliminary investigation showed that Rajagopal had been under depression for several years now as his son was mentally unsound. </p>.<p>Rajagopal worked in Hyderabad and retired recently. The family shifted to JP Nagar in Bengaluru. Rajagopal told his wife that he and Krishna would travel to Chennai for a function. He refused to take his wife along, police said and hinted that Rajagopal had planned the murder-cum-suicide in advance. </p>.<p>Police have booked Rajaopgal for murder and attempted suicide. </p>